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hello! I recently acquired this fossil jaw bone, it was stated that it was an elk fossil found in the Missouri River... I was wondering if anyone could give me an exact species? Also, the person unfortunately went sloppy wild with some 50/50 glue and it's smeared on the jaw bone and even covering some of the chewing surfaces of the teeth. Any hints on the best way to remove some of it?

Found a shoreline on the Missouri River in southeastern South Dakota with some mollusc fossils. There were lots like the one on the left, but only one I could find like the one on the right. Can anyone identify these?
They'd be from the Cretaceous period, right?
The fossil on the right is the size of a quarter. The ones on the left range from softball to golf ball.

Found this a number of years ago on some private property along the Missouri River in southeastern South Dakota. The area has a lot of buffalo remains, and some bivalves and shark fossils. This looks like nothing else I've seen before, and I believe it's a shark tooth.
Is this a shark tooth? If so, do you know what kind? It's about the exact size of a camera SD card, or slightly bigger than a quarter.
The image shows it from three different angles. Thanks for your help!

Hello folks I am new to the forum. I mostly hunt for arrow points but recently found this fossil tooth on a hunt and was looking for ID help. I found it on a sand island in the Missouri River in Missouri. It seems to be a molar of probably a herbivore, not sure what time period. About 1.25" long. Very cool deep blue color, the river has polished it like glass but all the fine details of the tooth are preserved. I would say it was a older animal judging by how worn the chewing side of the tooth is. Any help would be appreciated. Happy hunting!